Issues »  Volume 43, Issue 11

Influence of Cooling Rate at Hardening of Continuous Casting Blank on Parameters of Dendritic Structure of Carbon Steel with 0.54% C

O. I. Babachenko, K. H. D’omina, H. A. Kononenko, Zh. A. Dement’yeva, R. V. Podol’s’kyy, O. A. Safronova

Z. I. Nekrasov Iron and Steel Institute, NAS of Ukraine, 1 Academician Starodubov Sqr., UA-49050 Dnipro, Ukraine

Received: 02.04.2021. Download: PDF

The analysis of the formation process of the cast structure of carbon steel grade F (AAR M-101-2017) after the completion of its crystallization with a change in a wide range of metal cooling rate during solidification of a continuously cast billet (CCB) with a diameter of 470 mm is carried out. It is shown that when the cooling rate of the metal changes in the whole investigated interval (1–10$^6$)°C/min, the solidification of carbon steel grade F proceeds according to the mechanism of dendritic crystallization. Metallographic analysis reveals the heterogeneity of the distribution of chemical elements—silicon and manganese—in the microstructure of carbon steel grade F, which is formed during crystallization and is a consequence of dendritic segregation of these elements. Its quantitative characteristics are the size of the former dendrites, the density of the dendritic structure, the volume fraction of segregation areas and the distribution coefficient of the chemical element. It is determined that the effect of the metal cooling rate during the solidification of the investigated CCB on the size of dendritic crystals is described by the relationship $y$ = 342.48$x^{-0.163}$. It is established that by varying the cooling rate in the range (1–10$^6$)°C/min, one can achieve a significant change in the average size and density of dendritic crystals while maintaining the constancy of the volume fraction of segregation areas of silicon and manganese $\sim$25% in carbon steel (0.45–0.59% wt. C). It is determined that in the entire investigated range of cooling rates (1–10$^6$)°C/min, the coefficients of dendritic segregation $K^{\textrm{I}}_{\textrm{д}}$ and $K^{\textrm{II}}_{\textrm{д}}$ of silicon and manganese change insignificantly and amount to 1.8–1.9 and 1.5 for $K^{\textrm{I}}_{\textrm{д}}$ and $K^{\textrm{II}}_{\textrm{д}}$, respectively. In this case, the values of the coefficients $K^{\textrm{I}}_{\textrm{д}}$ and $K^{\textrm{II}}_{\textrm{д}}$ for both elements are practically constant in both pearlite and ferrite. Based on the results of X-ray microanalysis, it is established that the heterogeneity of the distribution of chemical elements, which is formed as a result of dendritic segregation of silicon and manganese, is the primary and constant component of the microstructure of carbon steel.

Key words: carbon steel, continuously cast billet, solidification, cooling rate, dendritic structure.

URL: https://mfint.imp.kiev.ua/en/abstract/v43/i11/1537.html

DOI: https://doi.org/10.15407/mfint.43.11.1537

PACS: 61.50.Ks, 68.70.+w, 81.05.Bx, 81.30.-t

Citation: O. I. Babachenko, K. H. D’omina, H. A. Kononenko, Zh. A. Dement’yeva, R. V. Podol’s’kyy, and O. A. Safronova, Influence of Cooling Rate at Hardening of Continuous Casting Blank on Parameters of Dendritic Structure of Carbon Steel with 0.54% C, Metallofiz. Noveishie Tekhnol., 43, No. 11: 1537—1551 (2021) (in Ukrainian)

REFERENCES
  1. A. Papapetrou, Zeitschrift für Kristallographie, 92: Iss. 1: 89 (1935). Crossref
  2. Ya. N. Malinochka, A. I. Dukhin, and E. N. Rusin, Chernaya Metallurgiya. Nauka-Tekhnologiya-Proizvodstvo, Iss. 38: 131 (1970) (in Russian).
  3. W. Kurz and D. J. Fischer, Acta Metall., 29, No. 1: 11 (1981). Crossref
  4. A. Suzuki, J. Japan Institute of Metals, 33, No. 6: 658 (1969). Crossref
  5. T. Z. Kattamis and M. C. Flemings, Transactions of the Japan Institute of Metals, 23, No. 6: 1523 (1966).
  6. M.-A. Taga, J. Materials Science Letters, No. 3: 307 (1986).
  7. V. S. Kovalenko and E. L. Zats, Izvestiya Vuzov. Chernaya Metallurgiya, No. 2: 102 (1971) (in Russian).
  8. S. Ye. Kondratyuk and O. M. Stoyanova, Metaloznavstvo ta Obrobka Metaliv, No. 1-2: 3 (1999) (in Ukrainian).
  9. K. Kishitake and T. Okamoto, Tetsu-to-Hagane, 63, No. 3: 425 (1977). Crossref
  10. M. Flemings, Protsessy Zatverdevaniya [Solidification Processing] (Moscow: Mir: 1977) (in Russian).
  11. R. E. Shalin, I. L. Svetlov, E. B. Kachanov, V. N. Toloraiya, and O. S. Gavrilin, Monokristally Nikelevykh Zharoprochnykh Splavov [Single-Crystals of Nickel Heat-Resistant Alloys] (Moscow: Mashinostroenie: 1997) (in Russian).
  12. S. S. Grankin and V. Ya. Sverdlov, Voprosy Atomnoy Nauki i Tekhniki. Seriya: Vakuum, Chistye Materialy, Sverkhprovodniki, No. 1: 162 (2008) (in Russian).
  13. A. N. Smirnov, V. L. Pilyushenko, A. A. Minaev, S. V. Molot, and Yu. N. Belobrov, Protsessy Nepreryvnoy Razlivki [Continuous Casting Processes] (Donetsk: DonNTU: 2002) (in Russian).
  14. V. T. Sladkosheev, V. I. Akhtyrskiy, and R. V. Potanin, Kachestvo Stali pri Nepreryvnoy Razlivke [The Quality of Steel during Continuous Casting] (Moscow: Gosudarstvennoe Nauchno-Tekhnicheskoe Izdatel'stvo po Chernoy i Tsvetnoy Metallurgii: 1963) (in Russian).
  15. A. I. Chizhikov, V. P. Perminov, V. L. Iokhimovich, V. E. Girskiy, L. I. Morozenskiy, and L. F. Grigor'ev, Nepreryvnaya Razlivka Stali v Zagotovki Krupnogo Secheniya [Continuous Casting of Steel into Large Section Billets] (Moscow: Metallurgiya: 1970) (in Russian).
  16. E. N. Smirnov, Metall i Lit'e Ukrainy, No. 3-4: 17 (2001) (in Russian).
  17. A. N. Smirnov, S. V. Kuberskiy, and E. V. Shtefan, Nepreryvnaya Razlivka Stali [Continuous Casting of Steel] (Donetsk: DonNTU: 2011) (in Russian).
  18. AAR M-101-2017. Axles, Carbon Steel, Heat-Treated.
  19. Otchet po Proektu: 'Sovershenstvovanie Skvoznoy Tekhnologii Proizvodstva Zheleznodorozhnykh Osey iz Nepreryvnolitoy Zagotovki Stali Marki F' [The Project Report: 'Improvement of the End-to-End Technology for the Production of Railway Axles from Continuously Cast Billets of Steel Grade F'] (Dnipro: OOO 'MZ 'DNEPROSTAL', PAO 'INTERPAYP NTZ', OOO 'INTERPAYP Ukraina': 2018) (in Russian).
  20. S. A. Saltykov, Stereometricheskaya Metallografiya [Stereometric Metallography] (Moscow: Metallurgiya: 1976) (in Russian).
  21. E. G. Demina, Zh. A. Dement'eva, A. S. Mirgorodskaya, and D. V. Gunchenko, Nauka i Metalurhiya, Iss. 2: 4 (2018) (in Russian).
  22. I. N. Golikov and S. B. Maslenkov, Dendritnaya Likvatsiya v Stalyakh i Splavakh [Dendritic Segregation in Steels and Alloys] (Moscow: Metallurgiya: 1977) (in Russian).
  23. Radius Atoma, Spravochnaya Tablitsa [Radius of an Atom, Reference Table] (in Russian).
  24. H. Oikawa, The Technology Reports of the Tohoku University, 47, No. 2: 215 (1982).

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